File::Basename upgraded to version 2.74,
with changes contributed by Michael Schwern.

Documentation clarified and errors corrected.

basename now strips trailing path separators before processing the name.

basename now returns / for parameter /,
to make basename consistent with the shell utility of the same name.

The suffix is no longer stripped if it is identical to the remaining characters in the name,
again for consistency with the shell utility.

Some internal code cleanup.

File::Copy upgraded to version 2.09

Copying a file onto itself used to fail.

Moving a file between file systems now preserves the access and modification time stamps

File::Find upgraded to version 1.10

Win32 portability fixes

Enhanced documentation

File::Glob upgraded to version 1.05

Internal cleanup

File::Path upgraded to version 1.08

mkpath now preserves errno when mkdir fails

File::Spec upgraded to version 3.12

File::Spec-rootdir()> now returns \ on Win32,
instead of /

$^O could sometimes become tainted.
This has been fixed.

canonpath on Win32 now collapses foo/.. (or foo\..) sections correctly,
rather than doing the "misguided" work it was previously doing.
Note that canonpath on Unix still does not collapse these sections,
as doing so would be incorrect.

Some documentation improvements

Some internal code cleanup

FileCache upgraded to version 1.06

POD formatting errors in the documentation fixed

Filter::Simple upgraded to version 0.82

FindBin upgraded to version 1.47

Now works better with directories where access rights are more restrictive than usual.

GDBM_File upgraded to version 1.08

Internal cleanup

Getopt::Long upgraded to version 2.35

prefix_pattern has now been complemented by a new configuration option long_prefix_pattern that allows the user to specify what prefix patterns should have long option style semantics applied.

Options can now take multiple values at once (experimental)

Various bug fixes

if upgraded to version 0.05

Give more meaningful error messages from if when invoked with a condition in list context.

Restore backwards compatibility with earlier versions of perl

IO upgraded to version 1.22

Enhanced documentation

Internal cleanup

IPC::Open2 upgraded to version 1.02

Enhanced documentation

IPC::Open3 upgraded to version 1.02

Enhanced documentation

List::Util upgraded to version 1.18 (was 1.14)

Fix pure-perl version of refaddr to avoid blessing an un-blessed reference

Use XSLoader for faster loading

Fixed various memory leaks

Internal cleanup and portability fixes

Math::Complex upgraded to version 1.35

atan2(0,
i) now works,
as do all the (computable) complex argument cases

Fixes for certain bugs in make and emake

Support returning the kth root directly

Support [2,-3pi/8] in emake

Support inf for make/emake

Document make/emake more visibly

Math::Trig upgraded to version 1.03

Add more great circle routines: great_circle_waypoint and great_circle_destination

MIME::Base64 upgraded to version 3.07

Use XSLoader for faster loading

Enhanced documentation

Internal cleanup

NDBM_File upgraded to version 1.06

Enhanced documentation

ODBM_File upgraded to version 1.06

Documentation typo fixed

Internal cleanup

Opcode upgraded to version 1.06

Enhanced documentation

Internal cleanup

open upgraded to version 1.05

Enhanced documentation

overload upgraded to version 1.04

Enhanced documentation

PerlIO upgraded to version 1.04

PerlIO::via iterate over layers properly now

PerlIO::scalar understands $/ = "" now

encoding(utf-8-strict) with partial characters now works

Enhanced documentation

Internal cleanup

Pod::Functions upgraded to version 1.03

Documentation typos fixed

Pod::Html upgraded to version 1.0504

HTML output will now correctly link to =items on the same page,
and should be valid XHTML.

Variable names are recognized as intended

Documentation typos fixed

Pod::Parser upgraded to version 1.32

Allow files that start with =head on the first line

Win32 portability fix

Exit status of pod2usage fixed

New -noperldoc switch for pod2usage

Arbitrary URL schemes now allowed

Documentation typos fixed

POSIX upgraded to version 1.09

Documentation typos fixed

Internal cleanup

re upgraded to version 0.05

Documentation typo fixed

Safe upgraded to version 2.12

Minor documentation enhancement

SDBM_File upgraded to version 1.05

Documentation typo fixed

Internal cleanup

Socket upgraded to version 1.78

Internal cleanup

Storable upgraded to version 2.15

This includes the STORABLE_attach hook functionality added by Adam Kennedy,
and more frugal memory requirements when storing under ithreads,
by using the ithreads cloning tracking code.

Switch upgraded to version 2.10_01

Documentation typos fixed

Sys::Syslog upgraded to version 0.13

Now provides numeric macros and meaningful Exporter tags.

No longer uses Sys::Hostname as it may provide useless values in unconfigured network environments,
so instead uses INADDR_LOOPBACK directly.

syslog() now uses local timestamp.

setlogmask() now behaves like its C counterpart.

setlogsock() will now croak() as documented.

Improved error and warnings messages.

Improved documentation.

Term::ANSIColor upgraded to version 1.10

Fixes a bug in colored when $EACHLINE is set that caused it to not color lines consisting solely of 0 (literal zero).

Improved tests.

Term::ReadLine upgraded to version 1.02

Documentation tweaks

Test::Harness upgraded to version 2.56 (was 2.48)

The Test::Harness timer is now off by default.

Now shows elapsed time in milliseconds.

Various bug fixes

Test::Simple upgraded to version 0.62 (was 0.54)

is_deeply() no longer fails to work for many cases

Various minor bug fixes

Documentation enhancements

Text::Tabs upgraded to version 2005.0824

Provides a faster implementation of expand

Text::Wrap upgraded to version 2005.082401

Adds $Text::Wrap::separator2,
which allows you to preserve existing newlines but add line-breaks with some other string.

threads upgraded to version 1.07

threads will now honour no warnings 'threads'

A thread's interpreter is now freed after $t->join() rather than after undef $t,
which should fix some ithreads memory leaks.
(Fixed by Dave Mitchell)

Some documentation typo fixes.

threads::shared upgraded to version 0.94

Documentation changes only

Note: An improved implementation of threads::shared is available on CPAN - this will be merged into 5.8.9 if it proves stable.

Tie::Hash upgraded to version 1.02

Documentation typo fixed

Time::HiRes upgraded to version 1.86 (was 1.66)

clock_nanosleep() and clock() functions added

Support for the POSIX clock_gettime() and clock_getres() has been added

Weak reference creation is now O(1) rather than O(n),
courtesy of Nicholas Clark.
Weak reference deletion remains O(n),
but if deletion only happens at program exit,
it may be skipped completely.

Salvador Fandiño provided improvements to reduce the memory usage of sort and to speed up some cases.

Jarkko Hietaniemi and Andy Lester worked to mark as much data as possible in the C source files as static,
to increase the proportion of the executable file that the operating system can share between process,
and thus reduce real memory usage on multi-user systems.

Parallel makes should work properly now,
although there may still be problems if make test is instructed to run in parallel.

Building with Borland's compilers on Win32 should work more smoothly.
In particular Steve Hay has worked to side step many warnings emitted by their compilers and at least one C compiler internal error.

Configure will now detect clearenv and unsetenv,
thanks to a patch from Alan Burlison.
It will also probe for futimes and whether sprintf correctly returns the length of the formatted string,
which will both be used in perl 5.8.9.

Previously when running with warnings enabled globally via -w,
selective disabling of specific warning categories would actually turn off all warnings.
This is now fixed; now no warnings 'io'; will only turn off warnings in the io class.
Previously it would erroneously turn off all warnings.

This bug fix may cause some programs to start correctly issuing warnings.

Perl 5.8.4 introduced a change so that assignments of undef to a scalar,
or of an empty list to an array or a hash,
were optimised away.
As this could cause problems when goto jumps were involved,
this change has been backed out.

Using the sprintf() function with some formats could lead to a buffer overflow in some specific cases.
This has been fixed,
along with several other bugs,
notably in bounds checking.

In related fixes,
it was possible for badly written code that did not follow the documentation of Sys::Syslog to have formatting vulnerabilities.
Sys::Syslog has been changed to protect people from poor quality third party code.

FindBin now works better with directories where access rights are more restrictive than usual.

Several memory leaks in ithreads were closed.
An improved implementation of threads::shared is available on CPAN - this will be merged into 5.8.9 if it proves stable.

Trailing spaces are now trimmed from $! and $^E.

Operations that require perl to read a process's list of groups,
such as reads of $( and $),
now dynamically allocate memory rather than using a fixed sized array.
The fixed size array could cause C stack exhaustion on systems configured to use large numbers of groups.

PerlIO::scalar now works better with non-default $/ settings.

You can now use the x operator to repeat a qw// list.
This used to raise a syntax error.

The debugger now traces correctly execution in eval("")uated code that contains #line directives.

The value of the open pragma is no longer ignored for three-argument opens.

The optimisation of for (reverse @a) introduced in perl 5.8.6 could misbehave when the array had undefined elements and was used in LVALUE context.
Dave Mitchell provided a fix.

Some case insensitive matches between UTF-8 encoded data and 8 bit regexps,
and vice versa,
could give malformed character warnings.
These have been fixed by Dave Mitchell and Yves Orton.

lcfirst and ucfirst could corrupt the string for certain cases where the length UTF-8 encoding of the string in lower case,
upper case or title case differed.
This was fixed by Nicholas Clark.

Perl will now use the C library calls unsetenv and clearenv if present to delete keys from %ENV and delete %ENV entirely,
thanks to a patch from Alan Burlison.

There has been a fair amount of refactoring of the C source code, partly to make it tidier and more maintainable. The resulting object code and the perl binary may well be smaller than 5.8.7, in particular due to a change contributed by Dave Mitchell which reworked the warnings code to be significantly smaller. Apart from being smaller and possibly faster, there should be no user-detectable changes.

Andy Lester supplied many improvements to determine which function parameters and local variables could actually be declared const to the C compiler. Steve Peters provided new *_set macros and reworked the core to use these rather than assigning to macros in LVALUE context.

Dave Mitchell improved the lexer debugging output under -DT

Nicholas Clark changed the string buffer allocation so that it is now rounded up to the next multiple of 4 (or 8 on platforms with 64 bit pointers). This should reduce the number of calls to realloc without actually using any extra memory.

The HV's array of HE*s is now allocated at the correct (minimal) size, thanks to another change by Nicholas Clark. Compile with -DPERL_USE_LARGE_HV_ALLOC to use the old, sloppier, default.

For XS or embedding debugging purposes, if perl is compiled with -DDEBUG_LEAKING_SCALARS_FORK_DUMP in addition to -DDEBUG_LEAKING_SCALARS then a child process is forked just before global destruction, which is used to display the values of any scalars found to have leaked at the end of global destruction. Without this, the scalars have already been freed sufficiently at the point of detection that it is impossible to produce any meaningful dump of their contents. This feature was implemented by the indefatigable Nicholas Clark, based on an idea by Mike Giroux.

The optimiser on HP-UX 11.23 (Itanium 2) is currently partly disabled (scaled down to +O1) when using HP C-ANSI-C; the cause of problems at higher optimisation levels is still unclear.

There are a handful of remaining test failures on VMS, mostly due to test fixes and minor module tweaks with too many dependencies to integrate into this release from the development stream, where they have all been corrected. The following is a list of expected failures with the patch number of the fix where that is known:

If you find what you think is a bug, you might check the articles recently posted to the comp.lang.perl.misc newsgroup and the perl bug database at http://bugs.perl.org. There may also be information at http://www.perl.org, the Perl Home Page.

If you believe you have an unreported bug, please run the perlbug program included with your release. Be sure to trim your bug down to a tiny but sufficient test case. Your bug report, along with the output of perl -V, will be sent off to perlbug@perl.org to be analysed by the Perl porting team. You can browse and search the Perl 5 bugs at http://bugs.perl.org/